Welding start position detecting apparatus for welding robot

Details Welding start position detecting apparatus for welding robot Welding start position detecting apparatus for welding robot

1993-01-11

1993-11-23

Shaw, Clifford C.

Electric heating

Metal heating

By arc

901 42, 901 46, B23K 912

Patent

active

052646777

ABSTRACT:
A welding start position detecting apparatus for a welding robot in which a first reference voltage and a second reference voltage having different voltage levels are set as comparison reference voltages in which, during a preset time period after start of searching operation, a voltage for detection of the welding start position is compared with the first reference voltage having a higher sensitivity and, when the welding start position detecting voltage comes across a level of the first reference voltage, the first reference voltage is switched to the second reference voltage having a lower sensitivity for comparing operation of the welding start position detecting voltage with the second reference voltage to thereby enable the detection of the welding start position on a base material even when an impedance around a welding torch changes.

REFERENCES:
patent: 4249062 (1981-02-01), Hozumi et al.
patent: 4538047 (1985-08-01), Nakano et al.

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